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From what I understand it is for fraud protection. If you steal a credit card you likely do not know what the billing zip code is. According to this blog[0] th

• imglorp 7y ago
  On that note, I just used a pump with EMV for the first time, (US, in Delaware) which didn't ask for zip. I guess they're just starting to get deployed.
• Sanzig 7y ago
  It's also extremely annoying when driving in the states as a Canadian, since our postal codes don't follow the same format. Canadian postal codes are six character alphanumeric strings with alternating letters and numbers, so you can't enter them on the keypad. The trick, which isn't obvious, is that you're supposed to drop the letters from your postal code, leaving three digits, and then append two zeros to the end. For example: K9Z 2P7 -> 92700. In Canada we don't have to deal with this, since pretty much all our pumps have supported EMV chip cards for years.
• takeda 7y ago
  I remeber a foreigner asking me what should he enter for zip code, when fueling, I did not know the answer, but I'm wondering how did he solve it.